Civil Engineering Reference
In-Depth Information
TABLE 1-8. MCL, Health Effects, and Monitoring Requirements for Disinfectants and Disinfection By-products
Maximum Contaminant
Level (MCL)—
(mg / L unless noted)
Name of Contaminant
Health Effects of Contaminant
Monitoring Requirements
Stage 1 D / DBPR
Disinfectants
Chlorine / chloramines: Monitor at the same sample
location as the TCR. Compliance based on run-
ning annual arithmetic average of monthly aver-
ages.
Chlorine
MRDL 4.0 (as Cl
2
)
Hemolytic anemia in dialysis
Chlorine Dioxide and Chlorite: Daily sample at dis-
tribution system entry point.
Chloramines
MRDL 4.0 (as Cl
2
)
Hemolytic anemia
Chlorine Dioxide and Chlorite: Daily sample at dis-
tribution system entry point.
Chlorine Dioxide
MRDL 0.8 (as ClO
2
)
Cancer risk
Disinfection By-products
Total trihalomethanes (TTHMs)
Haloacetic Acids (HAA5)
Chlorite
Bromate
0.080
0.060
1
0.010
Cancer risk
Cancer risk / nervous system / liver effects
TTHM / HAA: 4 quarterly samples. Compliance
based on running annual average.
Bromate: 1 sample per month (ozone systems only)
and running annual average.
Total Organic Carbon (TOC)
Treatment Technique
TOC: Source and treated water TOC sampled once a
month.
